For some unknown reason the maker of the most prolific disc burning software continues to make the process of creating an ISO file with their software a mystery. In addition, everyone else wants $30 to do this simple task for you...

Lucersoft ISO is not only free - it's super small and fast - it took only 84 seconds to do a 264 MB ISO on my system - Nero was taking longer than that just to setup the burning project (according to their instructions). It is also a single exe with no installation footprint - I ran it directly from the downloaded zip file.